| Autor: |
Yokota, Osamu, Yashima, Masatomo, Kakihana, Masato, Shimofuku, Akira, Yoshimura, Masahiro |
| Zdroj: |
Journal of the American Ceramic Society; May 1999, Vol. 82 Issue: 5 p1333-1335, 3p |
| Abstrakt: |
Zirconia-yttria (ZrO2-12 mol YO1.5) powders were prepared via an organic polymerized complex method that was based on the Pechini-type reaction route. A mixed solution of citric acid, ethylene glycol, and zirconium and yttrium ions were polymerized to form a transparent resin, which then became a black powder after charring at ?450°C. This product was used as a precursor for ZrO2-12 mol YO1.5. The formation of a metastable tetragonal (t´) phase with compositional homogeneity occurred when the precursor was heated at the rate of 10°Cmin up to a temperature >560°C. X-ray diffraction peaks became sharp with an increase in the heat-treatment temperature. A t´-form with cell parameters of a 5.1265(6) Å and c 5.1559(9) Å were obtained via heat treatment up to 1400°C. This study shows that the organic polymerized complex method is effective for obtaining the compositionally homogeneous metastable t´-form in the ZrO2-YO1.5system for short annealing times at relatively lower temperatures. |
| Databáze: |
Supplemental Index |
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